Heating-stove.



Patented uct. 2-2, 19m.-

' S. HLMGBEN.

HEATING STDVE.

- (Appmion med Jan. 29, 1901.)

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me Nonms Pezns en4 Pvorouwo.. wAsHlNuToN. b, c.

lthe fire chamber.

UNITED rares PATENT Fries,

HEATING-STOVE.

SPECIFICATION forming part of Letters Patent No. 685,288, dated October22, 1901.

Application filed January 29, 1901. Serial No. 45,247. (No modeLl ToaZZ- whom, t may concern,.-

Be it known that I, SWAN HOLMGREN, a citizen of the United States,residing at St. Paul, in the county of Ramsey and State of Minnesota,have invented certain new and useful Improvements in Heating-Stoves; andI do declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the igures of reference marked thereon,which form a partof this specification.l

Figure 1 is a sectional side elevation. Fig. 2 is a semisectional frontelevation. Fig. 3 is a cross-sectional View on the line fr of Fig. 2.Fig. 4 is a cross-sectional view on the line y 1/ of Fig. 2. l

1 is the base of the stove, from which the shell 2 rises and with thetop 3 resting on the shell, as shown. The base 1 is perforated, as

shown at 4, or it will be otherwise arranged4 to permit the freecirculation of air. The base and the shell may be of any size or shapeand of any fanciful design, but will preferably be circular, as shown.The top 3 is formed, preferably, conical in outline and with a series ofoutlet-openings 15 near the base of the top and just above the upperline of the shell 2, as shown, with an annular band or ring valve 16,fitting revolubly over the perforations l5, and withcorrespondingperforations 17 ,adapted to register with the openings 15.By this means a means is provided whereby the perforations 15 maybe-opened and closed or partially opened and closed by adjusting thering-Valve upon its seat upon the conical top. Thus the outflow of theair may beperfectly controlled from outside the stove.

5 is the fire-chamber, which is in the form of an oblong boX open at thetop and front, with the main door 6 of the stove leading into Theiirechamber rests upon a diaphragm or transverse partition 7, which issupported from the base or shell, so as to leave a space betweenit andthe base, which space may be lled with some heat-retaining substancev orcompound, such as sand, and the spaces between the dre-chamber and shellmay be likewise lled with a Similar heat-retaining material, asindicated at 8. The irechamber will preferably be su pported fromrtheshell bysuitable braces,as at 9.

Passing vertically upward through the bottorn of the base l and thediaphragm 7 at the sides of the fire-chamber are two dues 10 1l, oneoneach side, and united bya horizontallydisposed transverse iiue 12 atsome distance above'the iire-ehamber. The flues 10 and 11 also passthrough the massof sand or other heat-retaining medium 8 at the sides ofthe nre-chamber, as shown, so that the air in the flues will receive thebenefit of the heat radiating from the heat-retaining medium as itpasses upward through the lues.

In the upper part of the outer shell l is a conical shell or drum 13,connected to the interior of the shell 1 at its upper wider part andconnected to the center of the horizontal transverse flue 12 at itsthroat or narrowest part 14, as shown.

The air-dues 10 and ll, rising vertically through the shell at thesidesvof and outside the fire-pot, do not offer any obstruction to orproject over any part of thel re-pot, leaving the whole fire-pot thusentirely unobstructed, so as not to be interfered with in any manner bythel presence of the iiues. Then, again, the ilues rising verticallythrough the shell permitl the air to rise freely Vand rapidly andwithout obstruction from any inclinations or bends and-passes rapidlyinto the horizontal section 12, where it is suddenly turned at rightangles and subjected to the strong heatcurrents rising from the productof the c0111- bustion and from` Vthe, smoke conducting drum,ashereinafterrshown. The hot air then iiows rapidly into the lowersection 13 of the .conical drum and expands into the double conicaldrurn3 13, completely iilling the whole drum and expanding therein andescaping, as required, through the exit-ports 15. The chamber in the top3 above the outlets 15 forms an important feature of the invention, as alimited air-pressure is thereby formed by the expansion yof the hot airto serve as a means of accelerating the outflow of the air from theports 15 and keeping the flow constant and regular, serving to a limitedextent the same purpose as an air-chamber in a forcepump. This is animportant feature, and is not shown by any structure with which I amIOC) acquainted. The air by this arrangement is caused to pass rapidlythroughout the whole system of flues and chambers and subjected to theinfiuence of the products of the combustion in the best position tofully absorb the heat radiated therefrom. The sand or otherheat-retaining filling 8, which incloses the flues 10 11, serves animportant function in this connection, as it materially aids inimparting heat to the air as it passes through the lines, as well asretaining the heat and radiating it continuously into the surroundingatmosphere, thus requiring a less amount of fuel to produce the requiredresults.

18 is a drum having closed ends and arranged horizontally across theinterior of the shell at one side and above the lire-chamber and beneaththe line of the transverse flue 12 and in close proximity thereto andprovided with a branch due 19, leading rearward therefrom through theshell 2. Branching forward from the drum 18 are two branch flues 20 2land opening near the front of the shell 1 the iiues 20 21, preferablyinclined outward slightly, as shown, so as to extend the intake of theilues laterally. The intake branch llues 2O 21 are smaller than the drum18 and are arranged to open at the greatest possible distance from thedrum, the latter being arranged as near as possible at one side of theshell 2 and the intake ends of the branch ilucs being at the farthestpossible point on the opposite side the smoke and other products of thecombustion are caused to travel entirely to one side of the shell beforethey can enter the intake-fines and then traverse the entire distanceback again across the shell before they are permitted to escape by theway of the outlet 19. The drum 18 and fiue 19 20 21 form the means forthe outlet of the smoke and other products of the combustion, and byarranging this conducting medium in the extended form shown all thesmoke and flame will be first carried forward toward and in contact withthe front of the shell, so as to provide for its radiation therethrough,and thence backward. through the drum and dues, whereby the air withinthe shell surrounding the various flues and drums is highly heated, andthereby very greatly increasing the efficiency of the heater. The closeddrum 18 being closed at the ends provides an expansion-chamber, in whichthe products of the combustion will expand and be somewhat retarded, soas to exert a large influence upon the surrounding atmosphere and alsoupon the air passing through the iiues 10, 11, and 12. By placing thedrum 18 as near the transverse flue 12 as possible the full benefit ofthe heat radiating therefrom will be imparted to the iiues 10, 11, and12, so that none of it will be lost or wasted. By this arrangement avery compact and economical arrangement of dues and chambers is insuredand in which the radiation from the products of the combustion isutilized withV very little waste. By this arrangement the heat from thetire in the lire-chamber 5 is utilized to the greatest possible extent.

If wood is the fuel employed, a grate will not necessarily be requiredin the fire-box; but if coal is employed a grate 22 will be employedwhich will preferably be in the form of a removable basket-like structurc,as shown in Figs. 1 and 2f The main door 6 may be in two parts, ifrequired, and will be provided with the usual draft-admitting slides orwing-valves 23.

24 is a smaller door above the main door 6, through which the fuel maybe fed when the grate is employed, or this door may be also employed forthe same purpose when the grate is not employed, if preferred. Thesmaller door will preferably be provided with mica lights, (indicated at24 25.)

The base 1 may be supported upon legs in the ordinary manner instead ofby the extended base, if preferred.

Having thus described my invention, what. I claim as new is- 1. In aheating-stove, the combination of a shell or casing,a tire-potinclosedby the lower part of said shell or casing, fines opening downwardlythrough said shell, and rising vertically between said lire-pot and saidshell, a horizontal drum disposed transversely of said shell above saidfire-pot, and connected at its ends to the upper ends of said Verticalflues, a drum formed of two conical chambers united at their largerends, and connected at the lower end centrally to said transverse drum,a series of apertures in said drum at substantially the center thereof,and means for regulating the outflow from said apertures, whereby theair-currents are caused to pass rapidly upward in said vertical flues,be subjected to the infiuence of the heat radiating from the products ofthe combustion in said transverse drum, and expanded and subjected topressure in said double conical drum, substantially as set forth.

2. In a heating-stove, the combination of an inclosing shell, afire-pot, a transverse drum above said lire-pot, vertical fluesconnecting said drum with the open air beneath said lire-pot, a doubleconical drum connected to said transverse drum, and projecting abovesaid shell,apertures disposed centrally of said double conical drum, aclosed drum transversely disposed with relation to said shell at oneside and in close proximity to said firstmentioned transverse drum, anexit-flue leading from said closed drum, and contracted inlet-finesconnected into said closed drum, and opening Within said shell at themost rcmote points from said closed drum, and at the opposite side ofsaid shell therefrom, substantially as set forth.

In testimony whereof I aiiix my signature in presence of two witnesses.

SWAN HOLMGREN.

Witnesses:

ANDREW PETERSON, A. H. ARosIN.

YOO

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